title: Analytical solutions and moment analysis of chromatographic models for rectangular pulse injections.
abstract: This work focuses on the analysis of two standard liquid chromatographic models, namely the lumped kinetic model and the equilibrium dispersive model. Analytical solutions, obtained by means of Laplace transformation, are derived for rectangular single solute concentration pulses of finite length and breakthrough curves injected under linear conditions. In order to analyze the solute transport behavior by means of the two models, the temporal moments up to fourth order are calculated from the Laplace-transformed solutions. The limiting cases of continuous injection and negligible mass transfer limitations are evaluated. For validation, the analytical solutions are compared with the numerical solutions of models using the discontinuous Galerkin finite element method. Results of different case studies are discussed for linear and nonlinear adsorption isotherms. The discontinuous Galerkin method is employed to obtain moments for both linear and nonlinear models numerically. Analytically and numerically determined concentration profiles and moments were found to be in good agreement.
authors.affiliation: Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstrasse 1, 39106 Magdeburg, Germany; Department of Mathematics, COMSATS Institute of Information Technology, Park Road, Chak Shahzad, Islamabad, Pakistan. Electronic address: qamar@mpi-magdeburg.mpg.de.
authors.forename: Shamsul
authors.initials: S
authors.lastname: Qamar
authors.forename: Javeria N
authors.initials: JN
authors.lastname: Abbasi
authors.forename: Shumaila
authors.initials: S
authors.lastname: Javeed
authors.forename: Munawar
authors.initials: M
authors.lastname: Shah
authors.forename: Farman U
authors.initials: FU
authors.lastname: Khan
authors.forename: Andreas
authors.initials: A
authors.lastname: Seidel-Morgenstern
mesh_terms: D000327:Adsorption; D002845:Chromatography / Q000379:methods*; D003198:Computer Simulation; D020342:Finite Element Analysis; D007700:Kinetics; D016014:Linear Models; D008956:Models, Chemical; D017711:Nonlinear Dynamics; D015203:Reproducibility of Results
keywords: Analytical solutions; Chromatographic models; Discontinuous Galerkin method; Dynamic simulation; Moment analysis; Rectangular pulse injections